Effects of Holding Time on Microwave Properties of Mg4Nb2O9 Ceramics by the Solid-State Process

Hai Tao Wu; Yi Shan Jiang; Ying Zi Wang; Ya Ming Chen; Yun Long Yue

doi:10.4028/www.scientific.net/AMR.499.188

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 499Effects of Holding Time on Microwave Properties of...

Effects of Holding Time on Microwave Properties of Mg₄Nb₂O₉ Ceramics by the Solid-State Process

Abstract:

Corundum-type magnesium niobate (Mg₄Nb₂O₉) ceramics were synthesized by the conventional solid-state method, the effect of holding time during calcination and sintering process on microwave properties was studied in detail. The xrd results showed that the major phases were identified as the ordered corundum structure Mg₄Nb₂O₉ with minor secondary phases of orthorhombic-symmetry Mg₅Nb₄O₁₅. The morphology was obviously affected by holding times at sintering process and the relationships between the morphology and microwave properties were discussed. The results indicated that holding time at calcination process had negligible effect on the microstructure and microwave properties, while holding time at sintering process could obviously affect the microstructure and microwave properties of Mg₄Nb₂O₉. When calcination at 1100°C for 2h and sintered at 1350°Cfor 6h, the optimal microwave properties were ε_r~13, Q·ƒ~130,000GHz and τ_f~-50 ppm/°C.

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Periodical:

Advanced Materials Research (Volume 499)

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188-192

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.499.188

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Online since:

April 2012

Authors:

Hai Tao Wu, Yi Shan Jiang, Ying Zi Wang, Ya Ming Chen, Yun Long Yue

Keywords:

Holding Time, Magnesium Niobate, Microwave Properties, Solid-State Process

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